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●The national decree on fuel-burning systems specifies a maximum
depression of 0.04 bar in such rooms.
●Hoods can only be used safely with appliances connected to a
chimney if the room and/or flat (air/environment combination) is
ventilated from outside using a suitable ventilation hole approxi-
mately 500-600 cm2 large to avoid the possibility of a depression
being created during operation of the hood.
If you have any doubts, contact the relevant controlling authority
or building inspectors office.
●Since the rule for rooms with fuel burning appliances is outlet
hole of the same size as the ventilation hole, a hole of 500-600
cm2, which is to say a larger hole, could reduce the performance
of the extractor hood.
●If the hood is used in its filtering function, it will operate simply
and safely in the above conditions without the need for any of the
aforementioned measures.
●When the hood is used in its extractor function, the following
rules must be followed to obtain optimal operation:
short and straight outlet hose
keep bends in outlet hose to a minimum
never install the hoses with an acute angle, they must
always follow a gentle curve only
keep the hose as large as possible (120 mm Ø min.).
●Failure to observe these basic rules will drastically reduce the
performance and increase the noise levels of the extractor hood.